Weaver&#39;s knotter



Sept. 25, 1934. N. cooK wEAvERs KNOTTER Filed oct. 18, 1955 2sheets-shewh 1 Fig. 1.

/NVEA/TOR Y NORM/1N Co 0K of Sept. 25,1934. N COOK l v 1,974,846

' WEAVERS KNOTTER Filed oct. 1s, 1955 2 sheets-sheet 2 `ATTORNEY 110iapparatus.

` f .1re srATes; PATENT. FFICE 1,974,846` l WEAvEns KNOTTER Norman4Cook, Manchester, England' .Application october 18,1933, seriarNa.694,029

v. .in Great Britain October 29, 1932 12 claims; (o1. 289-3) i Thisinvention has referenceft'o apparatus for tying weavers knots, `andcommonlyreferred to ash "weavers knottersf and relates'moreparticularly'lto knottersotthe kind in which aknotting- .V biil rotates`between two sides ofiv the apparatus across whiroh thestrands to beknotted are laid and -which after ther-knot'is tiedfare drawn clearcfa-nd carried away from the knotting billby anwmltwardiy` swingingaction" of onelside ofthe In knotte'rsrof` the kind referred toit hashitherto been necessary fruthe operatorl to check slightly by holdingone or morehoflthe strands during therknotting operation, and while thisin '1.5i the .ordinary circumstances does not present any seriousobjection; asl the operator merely retains holdtoffthe strandslaiterlayinglthem Vacross the `lmotterl-it is `convenient for somerpurposes tobe ablev to operate thec knetter without retaining hold-.lofl thestrands, and this` invention has for its object to provide an` improvedknotter of the swinging-arm type referred to,lwhereby the need foriholdingfthe strands is overcomeand which, among yother featuresprovides, owing to the 255; automatic holding "of the strands more evenends tothe `knot than is` usually obtained whena.stranduoristrandsiisorare held by the user.

According' to` this `invention i apparatus of the kind referred to fortying weavers knots is pro! vided withxtwo `slots .on Teach side of theapparatus,v each slot having -coeoperating With it a clipping or holding4member working in conjunc` tion with the knotting bill, whereby thestrands are held and` released asf required duringwthe knottingoperation thus `avoiding the need for the operatortohold the strands."

The invention 'is more particularly` sett `forth with reference.tothe'aceompanying drawings wherein` various views of a weavers knetterornadeiaccordingwto the: invention andthe sequence'of `the knotting.operations are shown andi.

in which` Y Fig. 1 is a plan of a knetter', the swinging `arm beingatvthe top; i

45 Fig; 2":is7aside elevation looking towarduthe-` riedina supporti 10whicl'lis shown brokerr 551,1 away;""but which has' -a strap" orlike-handle is a side 1 elevation ofr the swinging arrn` s a partialside elevation `similar to'lig.`

mounted upon it through which` the operators handiis passed so that theknetter can be carried-on the hand in .such a manner as to leave thengers clear and Ato piace the trigger 11A conveniently in position lforoperation by the thumb, the support handle and trigger Vbeing` arrangedconveniently for usel on either hand,V though the knotter illustrated bythe drawings is-designed for the left hand.

Mounted on the support 10-and secured there-` on by a screw and nut -12are two main frame members 13 between which and on a part of the serew12 designed to-form a pivot a quadrant 14` is mounted. The two framemembers 13 diverge as they rise, as shown in Fig, tand at the top areshaped and extended tofo'rm a frame l5 on1 which various partsof theknotter to be described in greater detail later on, are mounted.

The quadrant 14 from which the trigger 11 pro jects, and by which it isoperated, has teeth 16 along its edge which engage with a worm 17 on' aknotting-bill spindle 18 which is mounted toI rotate in the back andfront members ofthe frame 15. YAt the-frontof the knotting bill spindle18 is the knotting-bill which is opened and closed when the spindleislrotated bycontact and non-contact of `thelroot- 19 of the movablemember with the eccentrically arrangedopening in a front crosslextending arm 20 of the frame 15.

A spring 21 anchored at the top against one framememher 13 and givenseveral turns round thescrew 12 presses against the underside of theAtrigger 11 and thus tends `to keep it and hence the quadrant also intheposition in which the whoieA apparatus is ready for use, itloeingunderstoodV that the whole of the knotting mechanism is worked bythe trigger. v

rejecting below the pivot Screw 12 is a portionof the quadrant which hasa slot 22 cut in it', the@ shape of which is shown in Fig. 2 `and alsoon the quadrant and near the back extremity of thisslot` 22 is a horn 23whichprojects across the apparatus-toward the swinging-arm side.

` Pivotally mounted on a` slight rearward extension of the frame member13 on the side opposite to the swinging-arm is a bell crank lever, onearm 2440i which has aro1ler25 mounted on its inside'face whichlies inthe slot 22, and the'other arm 26 of which engages afork 27 projectingdownwardly from a sliding arm 28 mounted to slide on securing screws29whichsecure a nxed side member 30to the rarne- 15 andbetween whichmembers the sliding arml28 is reciprocated The xedside member BOhas nearits front end Y a front `slot 31 and a back s1otf32and the sliding! estarm 28 also has front and back slots 33 and 34 respectively, and betweenthese slots 33 and 34 an arm 35 rises from the member 28 and crosses ina curve over and behind the knotting-bill toward the swinging arm 36which is pivoted at 37 at the rear of the frame to swing outwardly, aspring 38 being mounted on the pivot 37 to urge the swinging arm intothe normal closed position.

The swinging arm 3S, is turned across the front of the knotting bill andhas upon it a hood 39 which passes over the knotting bill, and it alsohas a slot 40 in which a cutting member 41 works and which is actuatedby an arm 42 passing through a slot in the front portion of the swingingarm. This arm is pivoted at 43 under` the swinging arm so as to swinghorizontally and actuates the cutter and the actuation is eiected byturning upward the inner end of the arm 42 at 44 where it is engaged bya co-operating portion of the frame and is held when the swinging arm ismoved outward.

On the inside oi the swinging arm is a slider 45 which has an upwardlyprojecting portion 46 slightly bent round at the iront so that betweenit and the front portion of the swinging arm a slot 47 is formed.

Projecting upwardly from the screw 43 to which it is convenientlyanchored is a spring 48 which though on the swinging arm will bereferred to for convenience as a fixed spring, and behind this, andcarried on the slider 45 is another spring 49. A slot 50 is thus formedbetween the two springs and when the slide is moved forward therespective slots 47 and 50 will be closed, and anything lying thereinwill be nipped.

Alternatively, and as shown in Fig. 6 instead of the springs 48 and 49on the inside the slider 45 is provided with an upstanding portion whichis slotted at 50 to correspond with the slot 50 between the springs 48and 49 and this slot which is conveniently narrower than that formedbetween the springs is suiilcient to hold the thread without the needfor nipping between springs. Either arrangement can be used though theformer is preferable when dealing with hard or springing yarns. Theslider 45 is not only adapted to slide, but

at its rear end it is adapted also to move slightlyl up and down the upand down movement at the rear being in fact the movement which pushes itforward. This movement is therefore effected through the co-operation cia pin 51 projecting from a downwardly extending part 52 of the slider 45which pin projects into the path of a pivoted arm 53, which by means ofa roller pin 54 pro-.

jecting through an opening in the adjacent frame member 13 comes intocontact with a cam facel quadrant when the horn is brought up near theend of the operative movement of the quadrant, and as the horn 23 andthe part it engages are shaped to co-operate the result of theirengagement is to swing the swinging arm outward on its pivot 37.

In operating the knetter, it is taken on the left hand, the knetterillustrated being designed for left hand, which however does not aifectthe construction or operation, and after the left thumb has been placedon'the trigger, the two` strands to be knotted are laid across thedevice.

One strand, i. e. the back strand is passed into the slot 50, across thedevice behind the arm 35, down the slots 34 and 32 of the slider and xedside arm respectively. The other strand i. e. the front strand is passedinto the slot 47 and into the slots 33 and 31 in the slider and xed armrespectively, and as it is pulled down into these two slots it iscarried over the hood 39 and thus passes underneath the hood and acrossthe knotting bill spindle just behind the bill and in passing from thisposition to the slots 33 and 31 it is guided into the slot of the cutterat the edge of the inwardhT turned front of the swinging arm.

When the two strands are placed in this position they will both lie atthe bottom of the slots and also will both lie across the knotting billspindle uncrossed, the front strand lying nearer to the knotting billthan the back strand. When in this position they can safely be released.

It will be noticed by reference to Fig. 2 that the slots on the sliderand on the fixed arm do not coincide and consequently as the strands aredrawn through the slots in the slider and the xed side, they are passedthrough on an incline as considered in plan, and are not drawn straightacross as they are in the open slots on the swinging arm. By thisangular disposition there is a certain degree of friction or dragapplied to the strands which tends to hold them against sliding orslipping. As soon as the trigger is depressed, the knotting bill beginsto rotate in a counter clockwise direction and simultaneously 'j thebell-crank lever arm 26 engaging the fork 27 moves the slider forward.Also at the same time the lever 53 is lifted and presses the pin 51upward which, through the mechanism already described moves the slider45 on the inside of the swinging arm and the spring 49 (where thisarrangement is used) is pressed against the spring 48 thus nipping thestrand lying in the slot 50 and the other strand in the slot 47 isnipped between the projecting portion 46 of the slider and the frontface of the swinging arm. Where the springs 48 and 49 are not used, theyarn in the slot 50 is heldsuinciently by its friction in the slot.

The strands at the swinging arm side are thus nipped as those at theopposite side have the tension on them slightly relaxed as the slots onthat side are aligned.

During the tying of the knot, the nipping pressure on the yarn at theswinging arm side is not relaxed, but at the opposite side the pressureis first relaxed by the slider being moved forward and is thenre-applied as the slider is moved backward, and is tightened still moreas the slider is moved back to a further extent which -g vmovement aswill be understood is governed by the shape of the slot 22.

Finally, as the tying is completed continued downward movement of thetrigger brings the horn 23 into co-operation with the downwardlyextending part 52 of the slider 45, and so forces the swinging armoutwardly, the arm drawing the knot off the knotting bill, and theoutward movement of the arm actuating the cutter at the front of theswinging arm and severing the strand which passes through it. The looseend caused by this cutting is the same length orapproximately the samelength as the end left by the cutting operation of the knotting-bill.

The first complete rotation of the knottingward and from the other sideof the knetter,

bill forms a4 loop ofithe front strand round the bill, and the backstrand` which is movedforward by the [slide-r on the iixed. side ispulled across the 'knetting` Ibill spindle into a position just behindthe bill. The second complete rotation gives a second loop te the frontstrand: and a first loop to the back strand and as the bill comes upitis openedrandcuts the back strand on the xedside, thus leaving onlythe front strand passing through the bill cutter and front slot on thexed side. i

As this cutting takes place the swinging arm begins to `open )and as`Ait opens it draws the looped strandsyoff the bill, which however'continues te hold: the cut strand over whichV the others are drawnandasthe .swinging arm moves further, out the front strand on the fixedside is cut by the cutter on the front thus releasing it from theiixedside and the two knotted strands are held in the slots of theswinging-arrn from which they are removed as the clipping membersrelease their hold whenV the pressure is relaxed. i It will thus beiseenthat the various strands are held as and whenrequired te conform withthe movements ofV the Yknetting bill and are also out as` and whenrequired during the progress of the` knetting` operation.

l WhatAI claim as my invention and desire to secure byLetters Patentis:-

1. In a weavers knetter, the combination of a frame, a support for saidframe, a rotatable knetting bill mounted in said frame, an actuatingelement for revolving said bill, an arm at one side of the knetterpivotally mounted on said frame for lateral swinging movement tomeans atopposite sides of said bill for guiding and gripping the threads to betied together, and mechanism for operating said means at both sides ofsaid bill independently of each other and in timed relationship to themovements of said bill.

2. In a weavers knetter, the combination of a frame, a support for saidframe, a rotatable knetting bill mounted in said frame, an actuatingelement ier revolving said bill, an arm at one side er the knetterpivotally mounted on said frame for lateral swinging movement toward andfrom the other side of the knetter, means at opposite sides of said billfor guiding and gripping the threads te be tied together, andconnections arranged to be operated by said actuating element foroperating said means te grip the threads at one side of said bill duringthe rst part of the rotation of the bill and to release one of them at apredetermined but later peint in the rotation of the bill.

3. In a weavers knetter, the combination of a frame, a support for saidframe, a rotatable U knetting bill mounted in said frame, an actuatingelement for revolving said bill, an arm at one side of the knetterpivotally mounted on said frame for lateral swinging movement toward andfrom the other side of the knetter, means at one side of said bill forgripping both threads but holding them spaced apart, means at the otherside of said bill for gripping one of said threads, and connectionsbetween both of said means and said element for utilizing the movementof said element to cause said means to grip the threads and te releasethem at predetermined points during the knetting operation.

4. In a weavers knetter, the combination of a frame, a support for saidframe, a rotatable knetting bill mounted in said frame, an actuatingelement for revolving` said bill, an armfat one side of Ithe knetterpivotally mounted on said frameV for lateral swinging movement tewardandfrom the otherside of the knetter, and means arranged to be operated bysaid element for gripping and releasing the threads as required duringthe knetting operation to avoid the necessity for holding the threads byhand.

5. Ina weavers knetter, the combination of a frame, a support for saidframe, a rotatable knetting` bill mounted in said frame, an actuatingelement for revolving said bill, an arm at one side of the knetterpivotally mounted on said `frame for lateral swinging movement. towardand from the otherside of the knetter, parts carried by said arm toprovide two thread guiding slots at one side of the bill, additionalparts at the opposite side of the knetter providing two slots, one infront of the other, for guiding said respective threads, means`cooperating with said slots to guide the threads in the desiredpositional relationship to said bill, and connections arranged te Vbeoperated by said element for relatively moving the Yparts at both sidesof the knetter for gripping and releasing the threads at the desiredpoints in the knetting operation and for swinging said arm outwardly atsubstantially the completion of said operation.

6. A knetter according to preceding claim 5, in which the threadclamping means at one side of the knetter includes a reciprocatingmember mounted on said arm, and that at the other side comprises a sidepiece at the latter side of the knetter and a slide mounted toreciprocate forward and backward relatively to and immediately besidesaid side piece, both said side piece and said slide having registeringslots to guide the two threads te be united, the connections operated bysaid element being arranged to reciprocate said member and said slide.

7. In a weavers knetter, the combination of a frame, a Vsupport for saidframe, a rotatable knetting bill mounted in said frame, an actuatingelement for revolving said bill, an arm at one side of the knetterpivotally mounted on said frame for lateral swinging movement toward andfrom the other side of the knetter, a member movably mounted on said armand cooperating with a part carried by the arm to clamp one of thethreads to be operated upon, Vadditional thread gripping means at theopposite side of the knetter, an internal cam on said element, andconnections actuated by said cam for eperating said member.

8. In a weavers knetter, the combination of a frame, a support for saidframe, a rotatable knetting bill mounted in said frame, an actuatingelement for revolving said bill, an arm at one side of the knetterpivotally mounted on said frame for lateral swinging movement toward andfrom the other side of the knetter, a member movably mounted on said armand cooperating with a part carried by the arm to clamp one of thethreads to be operated upon, additional thread gripping means at theopposite side of the knetter, cams on said element for operating saidmember to cause it to grip the thread and for subsequently swinging saidarm and said member away from the bill, and connections actuated by saidelement for operating said thread gripping means at the other side ofthe knetter.

9. In a weavers knetter, the combination of a frame, a support for saidframe, a rotatable knotting bill mounted in said frame, a swinging soiquadrant connected with said bill to revolve it, an arm at one side ofthe knotter mounted on said frame for lateral swinging movement towardand from the bill, a slide carried by said arm and cooperating withanother part carried by the arm to clamp one of the threads to beknotted, an internal cam on said quadrant, a lever mounted on said frameclosely beside the quadrant, a roll carried by said lever and arrangedto be engaged by said cam, and connections through which the movement ofsaid lever produced by said cam is transmitted to said slide to give theslide its thread clamping movement.

10. In a weavers knotter, the combination of a frame, a support for saidframe, a rotatable knotting bill mounted in said frame, a swingingquadrant connected with said bill to revolve it, a side piece rigid withsaid frame and projecting forward beside the bill, said side piecehaving two slots therein to receive and guide the strands of thread tobe tied together, a slide mounted between said bill and said side pieceand closely beside the latter for forward and backward movement, saidslide having two thread guiding slots arranged to register with theslots in said side piece in certain positions oi' the slide, a cam onsaid quadrant, and a lever arranged to be operated by said cam andassociated with said slide to reciprocate it in timed relationship tothe rotative movements of said bill.

11. In a weavers knotter, the combination with a frame, a rotatableknotting bill mounted in said frame, a swinging quadrant connected withsaid bill to revolve it, an arm at one side of the knotter mounted onsaid frame for lateral swinging movement toward and from the bill, aslide carried by said arm and cooperating with another part carried bysaid arm to clamp one of the threads to be knotted, two cams on saidquadrant, and connections between said cams and said slide for causingthe cams to operate successively during the movement of the quadrant togive said slide its thread clamping movement.

12. In a weavers knetter, the combination with a frame, a rotatableknotting bill mounted in said frame, a swinging quadrant connected withsaid bill to revolve it, an arm at one side of the knotter mounted onsaid frame for lateral swinging movement toward and from the bill, aslide carried by said arm and cooperating with another part carried bysaid arm to clamp one of the threads to be knotted, an internal cam onsaid quadrant, connections between said cam and said slide for causingthe first part of the swinging movement of the quadrant to operatethrough said cam to move said slide toward its thread clamping position,and an external cam 23 on said quadrant arranged to operate on saidslide at a later point in the swinging movement of the quadrant to holdthe slide in its thread clamping position during at least a portion ofthe swinging movement of said arm.

NORMAN COOK.

